Earnings per Share and Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2022	Jun. 27, 2021	Jun. 26, 2022	Jun. 27, 2021	Feb. 06, 2019
Net (loss) income
Net income	$ 69.7	$ 37.5	$ 124.2	$ 79.2
Shares
Shares (in shares)	33,500,000	33,800,000	33,600,000	33,800,000
Per Share Amount
Net income (in dollars per share)	$ 2.08	$ 1.11	$ 3.70	$ 2.34
Dilutive securities, principally common stock options
Common stock equivalents (in shares)	100,000	100,000	100,000	100,000
Common stock equivalents (in dollars per share)	$ (0.01)		$ (0.02)
Net (loss) income
Net income	$ 69.7	$ 37.5	$ 124.2	$ 79.2
Weighted average number of shares:
Shares (in shares)	33,600,000	33,900,000	33,700,000	33,900,000
Securities not included in the computation of diluted EPS
Net income (in dollars per share)	$ 2.07	$ 1.11	$ 3.68	$ 2.34
Dilutive securities, principally common stock options
Options to purchase shares of Class A common stock, anti-dilutive			0	0
Shares repurchased
Number of shares repurchased	140,233	30,917	433,623	62,070
Stock Repurchased During Period, Value	$ 18.2	$ 4.0	$ 61.1	$ 7.8
February 6, 2019 | Class A
Shares repurchased
Value of shares of the entity's Class A common stock authorized to be repurchased					$ 150.0
Remaining authorized repurchase amount	$ 36.3		$ 36.3